US11384274B2ActiveUtilityA1

Diverting agent and method of filling fracture in well using same

92
Assignee: MITSUBISHI CHEM CORPPriority: Dec 28, 2017Filed: Jun 24, 2020Granted: Jul 12, 2022
Est. expiryDec 28, 2037(~11.5 yrs left)· nominal 20-yr term from priority
Inventors:Tomoya FujitaTakahiro SakaChizuko Furo
E21B 43/26C09K 8/88C08L 29/04C09K 8/5083C09K 8/516C09K 8/508
92
PatentIndex Score
4
Cited by
21
References
6
Claims

Abstract

The diverting agent of the present invention contains resin particles of polyvinyl alcohol-based resin. The resin particles of polyvinyl alcohol-based resin are a particle mixture containing two or more types of resin particles having different particle diameters, and the diverting agent contains resin particles A of polyvinyl alcohol-based resin having a particle diameter of 1,700 μm or more in a range of 5 mass % to 95 mass % and resin particles B of polyvinyl alcohol-based resin having a particle diameter of 250 μm to 1,000 μm in a range of 5 mass % to 95 mass %.

Claims

exact text as granted — not AI-modified
The invention claimed is: 
     
       1. A diverting agent comprising resin particles of polyvinyl alcohol-based resin, wherein
 the resin particles of polyvinyl alcohol-based resin are a particle mixture containing two or more types of resin particles having different particle diameters, and 
 the diverting agent contains resin particles A of polyvinyl alcohol-based resin having a particle diameter of 1,700 μm or more in a range of 5 mass % to 95 mass % and resin particles B of polyvinyl alcohol-based resin having a particle diameter of 250 μm to 1,000 μm in a range of 5 mass % to 95 mass %. 
 
     
     
       2. The diverting agent according to  claim 1 , wherein the particle mixture has a bulk density of 0.57 g/ml to 0.85 g/ml and an angle of repose of 40° to 70°. 
     
     
       3. The diverting agent according to  claim 1 , wherein the particle mixture contains two or more types of resin particles having different shapes. 
     
     
       4. The diverting agent according to  claim 1 , wherein the polyvinyl alcohol-based resin has a degree of saponification of 90 mol % or more. 
     
     
       5. The diverting agent according to  claim 1 , wherein the polyvinyl alcohol-based resin is a polyvinyl alcohol-based resin containing a primary hydroxy group in a side chain. 
     
     
       6. A method of filling a fracture in a well which is a method of temporarily filling a fracture generated in a well, the method comprising:
 allowing the diverting agent according to  claim 1  to flow into a fracture to be filled with a flow of a fluid in the well.

Cited by (0)

No later patents cite this yet.

References (0)

No backward citations on record.